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Why glTransformFeedbackVaryings not Exists in QT?

  • Hi!

    I´m using QT to develop OpenGL aplications but i cannot use the glTransformFeedbackVaryings function to get my transformations feedback.

    Looking at the function specification, this function start to be a part of core profile from 4.1 version of OpenGL, but in all QOpenGLFunctions Objetcs , many of this functions simply not exists including the 4.1,4.2 and 4.3 objects.

    How can i solve it?

    Kind Reagards.

  • Are you using the wrangler library for extracting OpenGL function pointers?

  • In fact all my Objects that use OpenGL Commands are being inherited from QOpenGLFunctions Object , including my Widget all the code are working fine, but , now i´m trying collect the transformed vertices from the OpenGL pipeline, But when i try use this function it doesnt find anything...return to me not find the function...

    Kind Regards.

  • Yes ... try using the wrangler library inside your project. Pure OpenGL calls are limited to OpenGL 1.1 (in Windows environment), so to extract pointers to the hardware-implemented functions of your GPU you should make the "GLEW": part of your project.

  • Ok, i will try.
    Thanks so much for your help.


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